// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "port/blocking_counter.h"

#include <condition_variable>  // NOLINT
#include <mutex>               // NOLINT

#include "port/logging.h"
#include "port/std_mutex_lock.h"

namespace platforms {
namespace darwinn {

bool BlockingCounter::DecrementCount() {
  StdMutexLock lock(&mutex_);
  count_--;
  if (count_ < 0) {
    LOG(FATAL) << "BlockingCounter::DecrementCount() called too many times.";
  }

  if (count_ == 0) {
    cv_.notify_all();
    return true;
  }
  return false;
}

void BlockingCounter::Wait() {
  StdCondMutexLock lock(&mutex_);
  cv_.wait(lock, [this] { return count_ == 0; });
}

}  // namespace darwinn
}  // namespace platforms
